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This is Tide Lulamoon, she's a StarTrix baby!
Tide was named the same way Nova was, by Starlight making a list of names she comes up with, and Trixie doing a baby name bracket! They agreed one kid would be a Glimmer, the other would be a Lulamoon. They say markings like that symbolise very powerful magic... Tide was a grumpy, active baby, and hyper and curious as a foal. He would obsess over things, then suddenly not like them anymore. But he always loved watching TV. He knew it wasn't real, but was amazed with the fact that they could make it LOOK real. He's a lot like her mom, flashy, self-centred, and stubborn. He sometimes does little things in her mom's shows, and sometimes auditioned for every play he learned about, sometimes for a part, others for effects. Her cutie mark is a comedy mask and tragedy mask with gold ribbons behind them. They have a pet pseudowyrm that they summoned for a magic lesson. They are a canon ship kid.